This clue appeared in the NYT Crossword on Monday, March 16, 2026 (69 Across). The answer is hidden below until you want it. Monday puzzles are the easiest of the week, so the clue is likely a plain definition.
Answer length: 4 squares
First letter
O _ _ _
First and last letters
O _ _ L
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About the answer
OPAL as a word: (gemology) A precious gem, an iridescent gemstone found in the opal-silica mineral substrate (potch); (mineralogy) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO₂·nH₂O.
OPAL has been an answer 2 times in the NYT Crossword and Mini since November 15, 2025.
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